[Openstack-operators] [openstack-dev] [nova][ironic] Concerns over rigid resource class-only ironic scheduling
agarwalnisha1980 at gmail.com
Mon Sep 11 06:57:50 UTC 2017
It will help to consider this change for Queens release if you could let us
know your opinion/concerns over this change done in Pike release.
On Fri, Sep 8, 2017 at 1:36 AM, Nisha Agarwal <agarwalnisha1980 at gmail.com>
> >>Nisha is raising the question about whether or not we're making
> incorrect assumptions >>about how people are using nova/ironic and they
> want to use the non-Exact filters for >>VCPU/MEMORY_MB/DISK_GB, which as
> far as I have ever heard is not >>recommended/supported upstream as it can
> lead to resource tracking issues in Nova that >>eventually lead to
> scheduling failures later because of the scheduler thinking a node is
> >>available for more than one instance when it's really not.
> Just to clarify, I havent heard about this issue lately when we use
> non-Exact filters. (before Pike release).
> On Fri, Sep 8, 2017 at 1:27 AM, Matt Riedemann <mriedemos at gmail.com>
>> On 9/7/2017 2:48 PM, Nisha Agarwal wrote:
>>> Hi Ironic Operators,
>>> From Pike, ironic nodes get scheduled based on just the resource class
>>> from nova. Do you guys see any concerns over this "rigid resource class
>>> only ironic scheduling"?
>>> To be more specific, at your datacentre/production environment what all
>>> filters are configured in nova.conf (configuration file for nova) for
>>> scheduling an ironic node? Do you use RamFilter/DiskFilter/CoreFilter
>>> in the "use_baremetal_filters" for ironic nodes scheduling from nova?
>>> Thanks and Regards
>>> OpenStack Development Mailing List (not for usage questions)
>>> Unsubscribe: OpenStack-dev-request at lists.op
>> Some more background information is in the ironic spec here:
>> Also, be aware of these release notes for Pike related to baremetal
>> In Pike, nova is using a combination of VCPU/MEMORY_MB/DISK_GB resource
>> class amounts from the flavor during scheduling as it always has, but it
>> will also check for the custom resource_class which comes from the ironic
>> node. The custom resource class is optional in Pike but will be a hard
>> requirement in Queens, or at least that was the plan. The idea being that
>> long-term we'd stop consulting VCPU/MEMORY_MB/DISK_GB from the flavor
>> during scheduling and just use the atomic node.resource_class since we want
>> to allocate a nova instance to an entire ironic node, and this is also why
>> the Exact* filters were used too.
>> There are more details on using custom resource classes for scheduling
>> Nisha is raising the question about whether or not we're making incorrect
>> assumptions about how people are using nova/ironic and they want to use the
>> non-Exact filters for VCPU/MEMORY_MB/DISK_GB, which as far as I have ever
>> heard is not recommended/supported upstream as it can lead to resource
>> tracking issues in Nova that eventually lead to scheduling failures later
>> because of the scheduler thinking a node is available for more than one
>> instance when it's really not.
>> OpenStack Development Mailing List (not for usage questions)
>> Unsubscribe: OpenStack-dev-request at lists.openstack.org?subject:unsubscrib
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